Is it possible to comment&like as Facebook Fanpage rather as profile with massplanner?
Yes, but you can only do the action/s on a Page, so Comment and Like as Page to another Page
I dont understand perfectly?
If you have a FB Page associated with your account, on the Comment and Like tool Sources tab, you can add the Page you want to comment/like and you can execute the action as your page.
Ok i see. I can do this only on pages?
Not possible in groups?
That is a Facebook limitation, you cannot do anything group related with a page, you can only do it as you main account.